The manual provides instructions for converting Hammarlund HQ-110 and HQ-170 receivers to receive WWV signals at 2.5 MHz, which involves removing specific capacitors and adjusting transformers and capacitors for optimal signal reception. It advises using a signal generator and checking local signal reception capability before attempting the modification, and notes that the conversion sacrifices the 160-meter amateur band.
Manual Overview
The manual for converting Hammarlund HQ-110 and HQ-170 receivers to receive the 2.5 MHz WWV signal provides detailed instructions for technicians. The conversion requires sacrificing the 160-meter amateur band and is intended for those with appropriate technical knowledge and equipment, such as a signal generator. For the HQ-110, technicians should remove capacitor C8, adjust the dial to 1.9 MHz, and set the antenna trimmer to half mesh. The T20 transformer’s top oscillator slug is tuned counterclockwise until the 2.5 MHz signal is detected. Further adjustments involve turning the T16 transformer slug to its maximum counterclockwise position and peaking capacitor C53 and transformer T7 for maximum signal. For the HQ-170, capacitor C61 is removed, and the T23 transformer’s top oscillator slug is adjusted similarly. The T19 transformer slug is turned to its maximum counterclockwise position, followed by peaking capacitor C53 and the T12 slug for optimal signal reception. This procedure is straightforward but requires careful attention to component adjustments.
Quick Issues Covered
- HQ-110: Remove C8, adjust T20, T16, T7 for 2.5MHz reception.
- HQ-170: Remove C61, adjust T23, T19, T12 for 2.5MHz reception.
- Refer to HQ-170 schematic on page 25 for circuit tracing.
Overview
The product involves the conversion of Hammarlund HQ-110 and HQ-170 ham band receivers to receive WWV at 2.5 megacycles as a frequency standard and time signal source. The manual provides instructions for this conversion, which requires the removal of certain capacitors and adjustments to transformers and capacitors to tune the receivers to the desired frequency. The conversion sacrifices the 160-meter amateur band and is recommended only for individuals with suitable knowledge and equipment.
Specifications
Refer to the PDF for details.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
To convert the Hammarlund HQ-110 and HQ-170 receivers for the reception of WWV at 2.5 megacycles, certain modifications are required. For the HQ-110, remove capacitor C8, set the dial at 1.9 mc, and adjust the antenna trimmer to the 1/2 mesh position. Tune transformer T20’s top oscillator slug counterclockwise until the 2.5 me signal is heard, then adjust transformer T16’s slug to the maximum counterclockwise position and peak capacitor C53 for maximum signal. Finally, adjust transformer T7 counterclockwise for maximum signal. For the HQ-170, remove capacitor C61 from the oscillator rack, tune transformer T23’s top oscillator slug counterclockwise until the 2.5 me signal is heard, adjust transformer T19’s slug to the maximum counterclockwise position, peak capacitor C53 for maximum signal, and then peak T12’s slug for maximum signal. A signal generator is recommended for this modification, and it is advised to verify if the 2.5 me signal can be received in the local area before proceeding.
Operation
The conversion of HQ-110 and HQ-170 receivers for reception of WWV at 2.5 megacycles involves the following steps:
For HQ-110:
1. Remove capacitor C8.
2. Set the dial at 1.9 mc and the antenna trimmer at the 1/2 mesh or vertical position.
3. Tune transformer T20 top oscillator slug counterclockwise until the 2.5 me signal is heard.
4. Turn the slug of transformer T16 to the maximum counterclockwise position.
5. Peak capacitor C53 for maximum signal.
6. Adjust transformer T7 counterclockwise for maximum signal.
For HQ-170:
1. Remove capacitor C61 from the oscillator rack.
2. Tune transformer T23 top oscillator slug counterclockwise until the 2.5 me signal is heard.
3. Turn the slug of T19 top to the maximum counterclockwise position.
4. Peak capacitor C53 for maximum signal.
5. Peak T12 slug for maximum signal.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download 2.5MHZ-SHEET Manual (PDF – 295.7 KB)
Hammarlund HQ-110 2.5MHz Conversion Manual: Guide for technicians to perform frequency conversion and adjustments. PDF size: 295.7 KB.
- Brand: Hammarlund-hq-110-conversion-wwv
- Model: 2.5MHZ-SHEET
- Type: Manual
- File size: 295.7 KB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download 2.5MHZ-SHEET manual (PDF)
Hammarlund HQ-110 Conversion WWV 2.5MHz Overview
The Hammarlund HQ-110 Conversion WWV 2.5MHz is a precision frequency converter designed to interface with the Hammarlund HQ-110 receiver for accurate WWV time signal reception at 2.5 MHz. This manual provides detailed instructions on converting and optimizing the HQ-110 to improve its performance in receiving WWV broadcasts, which are essential for timekeeping and frequency calibration.
Main Features and Specifications
- Frequency conversion optimized for 2.5 MHz WWV signals
- Compatibility with Hammarlund HQ-110 receiver model
- Improved signal stability and selectivity
- Compact and easy-to-install conversion module
- Detailed schematic and wiring instructions included
- Supports accurate time signal reception for calibration purposes
Basic Usage and Operation Tips
To operate the HQ-110 with the WWV 2.5MHz conversion, first ensure the conversion module is correctly installed as per the manual instructions. Tune the HQ-110 receiver to the 2.5 MHz WWV frequency and adjust the receiver controls for optimal signal clarity. Use the conversion’s built-in adjustments to fine-tune frequency alignment and signal strength. Regularly monitor the signal quality and recalibrate if necessary to maintain precise reception.
Troubleshooting and Maintenance
If you experience weak or distorted signals, verify all wiring connections are secure and free from corrosion. Check the conversion module components for any visible damage or wear. Ensure the HQ-110 receiver’s internal tubes and components are functioning correctly, as these can impact overall performance. Periodic cleaning of contacts and careful inspection of the conversion circuitry will help maintain reliable operation.
Safety Reminder
Always disconnect the HQ-110 receiver from power before performing any installation or maintenance work on the conversion module. Handle electronic components with care to avoid static discharge damage. Follow all safety guidelines in the manual to prevent electrical shock or equipment damage.
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